Casing elevator



. half round'casing engaging portions, The,

February 27, 1923,

'COIlSlStS of a single piece UNITED [sTAT-ES' ATENT OF I E.

KBELL, 'OF S ALPULPA, OKLAHOMA.

Original no. 1,504,355, m anin 11st 12,

' r flCA SING' 'nmivn 'ron.

. reissue'flled August 25, 1927. Serial No..215,492.

This invention relates to casing elevators for wells, and the primary object of the 11'1- vention is to provide an efficient form of casingelev'ator, in which self-seating jaws are provided for grippingthe well casing. In my former Patent, No. 1,446,568, granted I have disclosed a similar-construction of casing elevator, in which the co-ope'rating casing engaging jaws each of'metal, having elevator disclosed in that patent has proven {to have a very high degree of efiiciency, but

in order. to manufacture it, it is necessary to machine the half round portions carefully, a'process which on account of the sha-pe'is more than an ordinary machine operation.

The present invention contemplates an ele-- vator having jaws which will not require the fine,..ca'reful work involved in .m'anufacture.

of the elevator shown in my former patent. To this end, I have i re-arranged the parts somewhat and have. constructed each aw of two members which are hinged together so thatthere will be a light play between the complementary members of,;each jaw, enabling the jaws evenly though they. are not thoroughly bers of one jaw-and the pin for connecting machined. 1 p 7 The noveltyfwill be" apparent by. reference to the following description in connection with the. accompanying drawings, in which Fig. 1 is a perspective viewof a casing elevator, constructed in accordance with my invention.

Fig. 2 1s a disassociated view of two mem them. j V V Fig. 3 is'a View, partly in plan and partly in section of one of-the jaws. r

Fig. 4 is a top plan view of the elevator,

the support-links being shown in section.

- Fig. 5 is a vertical sectional view of one of .the jaw members showing its one of its supporting rocker arms.

As shown in my prior patent, theelevator frame consists of two side bars, 1 and 2, and

7 two end members 3 and 4, whichare shown as shafts. The end members are keyed to the ends of the side members by keys 5 (see Fig. 4) in the metal portions-of the .end members 3 and 4 are sleeves 6 and 7. These are also keyed to shafts 3 and 4. The sleeves to seat upon the casingrelation to the tubing.

, Between the sleeves Sand? and the ends of the side bars 1 and 2 are inwardly and up wardly disposedrocking levers or arms 12, 18, 14 and 15, having rigid collars or sockets 16, 17 18 and l9, in which are mounted the trunnionsof the respective jaws 20 and 21.

The complementary alike; therefore, I have shown one jaw constructionfli'n detail in Figs. 2 and 3. Each jaw consists of two' segmental members, 22 and 23, having trnnnions 24 and 25 respectively, which are received in the collars 16, 17 '18 and 19. The two members of each jaw are hinged together; one member, for example 22, isprovided with two spaced, perforate lugs 26 and 27 The other member, for example '23, is provided with one per: forate lug 28, which is received between the tw .hlgsflfi and 27, the lugs being secured "by a pin or pintle-29, which passes through them to form a hinge.

'connected so that when they are moved into casing-engaging position, there will be four jaw members,each distinguished from two jaw. members, shown in my prior patent.

In order to allow the jaw members, the trunnion's 24 and 25 do not fit tightly into the collars, it being obvious that in order members to seat evenl all around'the casing, only a very slight p ay is necessary.

The jaw members are'held in'normal parallelism by the transverse pins 30 and 31, in substantially the same way as shown in my former patent, and so in this application, I do not lay any special stress on the form of the mechanism, aside from the jaws, and in this construction as well as in the construction shown -in my former patent, jaw opening linkage 32 may be provided. The side bars 1 and 2 are held on the shaft by the end plates 33, 34, 35 and 36.

inks 10 and 11 are loose in the the necessary play for.

1924, Serial. ms. 644,338, filedlu ne a, 1923; i somnia i finding its own seat, as

to permit the jaw What I claim and ters Patent is:

1. In a. casing elevator, shafts, rocker arms carried 6 and casing-engaging jaws carried by the rockerarms, each jaw consisting of two members having a hinged connection.

I 2. In a casing elevator, a frame, inwardiy and upwardly projecting rocker arms carried 10 by the frame, and casing-engaging jaws desire to secure by Leta frame, rock by the shafts,

trunnioned on the rocker arms, each jaw comprising two segmental members, and means for hinging the two members together. In a casing elevator, a frame, rocker arms carried by the frame, and segmental 1-5 I jaw members hinged together in pairs and supported by the rocker arms.

In testimony-whereof I 'aflix 'my signature.

GEORGE KREFLL, 

